libifupdown: add lif_execute_fmt()

This commit is contained in:
Ariadne Conill 2020-07-23 06:12:56 -06:00
parent 7f8f93a29b
commit a567d5d0f5
4 changed files with 81 additions and 1 deletions

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@ -16,7 +16,8 @@ LIBIFUPDOWN_SRC = \
libifupdown/fgetline.c \
libifupdown/version.c \
libifupdown/state.c \
libifupdown/environment.c
libifupdown/environment.c \
libifupdown/execute.c
LIBIFUPDOWN_OBJ = ${LIBIFUPDOWN_SRC:.c=.o}
LIBIFUPDOWN_LIB = libifupdown.a

54
libifupdown/execute.c Normal file
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@ -0,0 +1,54 @@
/*
* libifupdown/execute.c
* Purpose: execution of individual commands
*
* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* This software is provided 'as is' and without any warranty, express or
* implied. In no event shall the authors be liable for any damages arising
* from the use of this software.
*/
#include <errno.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <spawn.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "libifupdown/execute.h"
#define SHELL "/bin/sh"
bool
lif_execute_fmt(char *const envp[], const char *fmt, ...)
{
char cmdbuf[4096];
va_list va;
va_start(va, fmt);
vsnprintf(cmdbuf, sizeof cmdbuf, fmt, va);
va_end(va);
pid_t child;
char *argv[] = { SHELL, "-c", cmdbuf, NULL };
if (posix_spawn(&child, SHELL, NULL, NULL, argv, envp) != 0)
{
fprintf(stderr, "execute '%s': %s\n", cmdbuf, strerror(errno));
return false;
}
int status;
waitpid(child, &status, 0);
return WIFEXITED(status) && WEXITSTATUS(status) == 0;
}

24
libifupdown/execute.h Normal file
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@ -0,0 +1,24 @@
/*
* libifupdown/execute.h
* Purpose: execution of individual commands
*
* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* This software is provided 'as is' and without any warranty, express or
* implied. In no event shall the authors be liable for any damages arising
* from the use of this software.
*/
#ifndef LIBIFUPDOWN_EXECUTE_H__GUARD
#define LIBIFUPDOWN_EXECUTE_H__GUARD
#include <stdarg.h>
#include <stdbool.h>
extern bool lif_execute_fmt(char *const envp[], const char *fmt, ...);
#endif

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@ -24,5 +24,6 @@
#include "libifupdown/version.h"
#include "libifupdown/state.h"
#include "libifupdown/environment.h"
#include "libifupdown/execute.h"
#endif